Cash Equivalents and Investments in Marketable Securities

The following tables present summaries of the Company's cash equivalents and investments in marketable securities measured at fair value on a recurring basis:



			Fair Value Measurements
	Total		Quoted prices in active market Level 1		Significant other observable inputs Level 2		Significant unobservable inputs Level 3
	(unaudited; in thousands)
As of June 30, 2019:

Money market funds	$	9,111	$	9,111	$	—	$	—
Commercial paper	3,803		—		3,803		—
U.S. treasuries	3,991		3,991		—		—
Total	$	16,905	$	13,102	$	3,803	$	—

Classified as:
Cash equivalents	$	13,417
Marketable securities at fair value	3,488
Total	$	16,905



			Fair Value Measurements
	Total		Quoted prices in active market Level 1		Significant other observable inputs Level 2		Significant unobservable inputs Level 3
	(in thousands)
As of December 31, 2018:

Money market funds	$	4,830	$	4,830	$	—	$	—
Commercial paper	1,497		—		1,497		—
Corporate notes and bonds	6,989		—		6,989		—
U.S. treasuries	8,375		8,375		—		—
Total	$	21,691	$	13,205	$	8,486	$	—

Classified as:
Cash equivalents	$	7,829
Marketable securities at fair value	13,862
Total	$	21,691

The Company did not transfer any marketable securities measured at fair value on a recurring basis to or from Level 1 and Level 2 during the six months ended June 30, 2019.

The following tables summarize the unrealized positions for available-for-sale securities disaggregated by class of instrument:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(unaudited; in thousands)
As of June 30, 2019:
Money market funds	$	9,111	$	—	$	—		$	9,111
Commercial paper	3,804		—		(1		)	3,803
U.S. treasuries	3,990		1		—			3,991
Total	$	16,905	$	1	$	(1	)	$	16,905



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
As of December 31, 2018:
Money market funds	$	4,830	$	—	$	—		$	4,830
Commercial paper	1,497		—		—			1,497
Corporate notes and bonds	6,994		—		(5		)	6,989
U.S. treasuries	8,375		—		—			8,375
Total	$	21,696	$	—	$	(5	)	$	21,691